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Third Quarter 2005 Groundwater Monitoring Report <br /> Boyett Petroleum,419 S.Main,Manteca,CA <br /> Page 3 <br /> . tertiary-butanol (TBA), di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl <br /> ether(TAME), 1,2-dichloroethane(1,2-DCA), and 1,2-dibromoethane(EDB). <br /> The laboratory analytical results for the third quarter 2005 quarterly groundwater monitoring event are <br /> Presented in Table 3. A map presenting MTBE concentrations in groundwater is included as Figure 4, <br /> attached. <br /> Table 3: Laboratory A alytica!Results Se tembelr 30 2005 <br /> Other <br /> B T E X TPH-G MTBE Oxygenates/ <br /> Additives <br /> Detection 0.5 0.5 0.5 1.0 0.05 0.5 0.5-5.0 <br /> Limits: pg/L pg/L µg/L jtg/L mg/L pg/L Ag/L <br /> Analytical Method: 8260B 8260B 8260B 826013 8015M 8260B 8260B <br /> Sample I.D. Well LD. <br /> MW-2 MW-2 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-3 MW-3 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-4R MW-4R <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-6 MW-6 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0:5-<5.0 <br /> MW-7 MW-7 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-8 MW-8 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> • MW-9 MW-9 <0.5 <0.5 <0.5 <1.0 <0.05 1.9 <0.5-<5.0 <br /> MW-10 MW-10 <0.5 <0.5 <0.5 <1.0 <0.05 <0.5 <0.5-<5.0 <br /> MW-11 MW-11 <0.5 <0.5 <0.5 <1.0 <0.05 7.5 <0.5-<5.0 <br /> EW-1 EW-1 <0.5 <0.5 <0.5 <1.0 1 <0.05 1 <0.5 1 <0.5-<5.0 <br /> Unit Conversions al ica <br /> pg/L:parts per billion(ppb). BTEX=benzene,toluene,ethyl benzene,and total xylenes. <br /> mg/L:parts per million(ppm), TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> MTBE=methyl tertiary-butyl ether, <br /> Other oxygenates additives=ethanol(EtOH),tertiary-butanol(TBA),di-isopropyl ether(RIPE), <br /> ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl ether(TAME), 1,2-dichloroethane(1,2- <br /> DCA),and 1,2-dibromoethane(EDB). <br /> Laboratory analytical results indicate that BTEX constituents, gasoline oxygenates/additives other than <br /> MTBE, and TPH-G were not detected at or above the laboratory reported detection limits in the <br /> groundwater samples collected from the monitoring wells. MTBE was detected in the groundwater <br /> samples collected from MW-9 and MW-11. MTBE was not detected at or above the laboratory reported <br /> detection limit of 0.5 µg/L in the groundwater samples collected from MW-2, MW-3, MW-4R, MW-6, <br /> MW-7,MW-8, MW-10, and EW-1. <br /> DISCUSSION AND RECOMMENDATIONS <br /> Laboratory analytical results for the groundwater samples collected from the Site monitoring wells on <br /> September 30, 2005, indicate that MTBE was detected at concentrations below the California Department <br /> • of Health Services Primary Maximum Contaminant Level (MCL) of 13 µg/L in the groundwater samples <br /> L� CONDOR <br />